Gold mining is the resource extraction of gold by mining. As of 2017, the world's largest gold .. These are small machines that float on the water and are usually operated by . Other gold mines use underground mining, where the ore is extracted .. Jump up ^ "Dan Oancea Carlin: Where the Train Stops and the Gold Rush.
Jul 16, 2018 . The Ore Mining Effluent Guidelines and Standards are incorporated into NPDES . rock) from underground mines and surface mines using machinery, . EPA conducted a study of the copper, lead, zinc, gold, silver and.